/*
 * Copyright 2013-2023 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.cloud.kubernetes.discoveryserver;

import java.util.List;

import reactor.core.publisher.Mono;

import org.springframework.cloud.kubernetes.commons.discovery.ConditionalOnHttpDiscoveryCatalogWatcherEnabled;
import org.springframework.cloud.kubernetes.commons.discovery.ConditionalOnKubernetesCatalogEnabled;
import org.springframework.cloud.kubernetes.commons.discovery.EndpointNameAndNamespace;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author wind57
 */
@RestController
@ConditionalOnKubernetesCatalogEnabled
@ConditionalOnHttpDiscoveryCatalogWatcherEnabled
class DiscoveryCatalogWatcherController {

	private final HeartBeatListener heartBeatListener;

	DiscoveryCatalogWatcherController(HeartBeatListener heartBeatListener) {
		this.heartBeatListener = heartBeatListener;
	}

	@GetMapping("/state")
	Mono<List<EndpointNameAndNamespace>> state() {
		return Mono.defer(() -> Mono.just(heartBeatListener.lastState().get()));
	}

}
